Now the author, University of Oregon Professor Jeremy Piger, posted some FAQs and data for the chart online. Professor Piger writes:

2. How should I interpret these probabilities as a recession signal?

Historically, three consecutive months of smoothed probabilities above 80% has been a reliable signal of the start of a new recession, while three consecutive months of smoothed probabilities below 20% has been a reliable signal of the start of a new expansion. For an analysis of the performance of the model for identifying new turning points in real time, see: